A dosimetric leaf-setting strategy for shaping radiation fields using a multileaf collimator

摘要: A dosimetric leaf-setting strategy of using multileaf collimators (MLC) for shaping radiation fields has been developed. Existing MLC strategies are all based upon geometric criteria. This new approach, however, matches a prescribed field contour with clinically consistent The leaf positions determined an iterative optimization algorithm. An empirical dose model was developed to compare the dosimetric-based geometric-based strategies. Differences up half centimeter in and isodose lines were found between setting geometrically dosimetrically. provides ability achieve better conformation desired line. Since line that covers treatment volume is typically higher than 50% maximum dose, scalloping effects due finite width at edge or much reduced. Another benefit it separates process from planning process, this frees vendors developing detailed models various existing types future upgrades systems.